MSX Info pages

Dos and disks

SD MMC drive by Sharksym

See the special SD MMC drive page  

DISKROM

 Fast diskROM for NMS8250/55/80, replace the current one with an EPROM with this diskrom. Speeds up I/O to the floppy disk drive.  

MSX-DOS 2

MSX-DOS inside
 Build MSX-DOS 2 in the MSX

Alternative MSX-DOS 2 circuits
Correction by Emil Sokolowski: In de uitleg van Bas Kornalijnslijper zit een foutje, of eigenlijk er ontbreekt nog een regel.
 Het gaat om de volgende PDF:
Als je dit uitvoert zoals beschreven dan zal de Dos 2.20 niet werken, het slotselect signaal op de adres decoder 74ls138 is vergeten.
Als je bij punt 12 en 14 de volgende uitleg er bij zet zal het kloppen. Er staat bij 12 en 14 het volgende:
12/14: 27512 pen 22 (OE) met een ......
Dit moet worden:
12/14: 27125 pen 22(OE) en 74ls138 pen 4 (slotselect) met een ......
Nu werkt de adresdecoder naar behoren en de Dos 2.20 zal geinstalleerd zijn

 MSX DOS2 builtin design and PCB by Erik Luppes

 VG8235 or
 NMS8250/55/80 or
 MSX DOS2 inbouw

 External MSX-DOS 2 cartridge as designed by Peter Overbeek,
 rom contents for MSX-DOS 2.2 en 2.23

Other

MSX cassette system: connecting two MSX computers via the cassette interface, use a PC as cassette recorder with high speed, programs and links. A side effect of my current projects with standalone MSX computers with all kind of i/o.
 Page on the MSX cassette system

BEER IDE 202 interface

How to make a IDE HDD drive interface for MSX
By Egor voznesensky (SOLID)

Partitioning program by Adriano daCunha
- BEER202 BIOS manages a fixed number of 5 drives (each drive is a "partition" );
- each partition can have max 32MB;
- partitioning scheme is proprietary;
- only CHS mode is supported by latest BEER BIOS (1.80);
- you don't need mapper or MSXDOS2;
- 52KB/s reading speed with my WSX;

Two more remarks:
-partitioning program was hanging with a Samsung SV0432A HD during initialization (while getting drive identification). I discovered that
patching BEER BIOS at offset 3862h from F0h to FFh solves this issue.
- unfortunatelly, BEER202 doesn't work ok with two HDs (Samsung, 4.3GB, and a Seagate Medalist 8422, 8.6GB).

 BEER 202 IDE diy
hddrom.mac - ROM source (diskrom)
hddide.gif - Schematic

 BEER 202 sources of ROM and (untested) HD partitioning program

 Partitioning program by Adriano

Pictures by DaBest of a build interface:
http:/dabest.atspace.com/msx.html

From Luiz Leo:
Article that explains how the interface works: "How to connect an IDE disk to a microcontroller using an 8255".
This document includes info about how it works, IDE commands, limitation of 32 mb per volume, etc. It can be useful to those who want to write utilities for this interface: http:/www.pjrc.com/tech/8051/ide/wesley.html

 PCB-design for BEER IDE, by Arnold Metselaar! Eagle format and postscript, design is not tested, use at your own risk

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